drivers/soc/qcom/qcom_stats.c

Source file repositories/reference/linux-study-clean/drivers/soc/qcom/qcom_stats.c

File Facts

System
Linux kernel
Corpus path
drivers/soc/qcom/qcom_stats.c
Extension
.c
Size
11697 bytes
Lines
431
Domain
Driver Families
Bucket
drivers/soc
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct subsystem_data {
	const char *name;
	u32 smem_item;
	u32 pid;
};

static const struct subsystem_data subsystems[] = {
	{ "modem", 605, 1 },
	{ "wpss", 605, 13 },
	{ "adsp", 606, 2 },
	{ "cdsp", 607, 5 },
	{ "cdsp1", 607, 12 },
	{ "gpdsp0", 607, 17 },
	{ "gpdsp1", 607, 18 },
	{ "slpi", 608, 3 },
	{ "gpu", 609, 0 },
	{ "display", 610, 0 },
	{ "adsp_island", 613, 2 },
	{ "slpi_island", 613, 3 },
	{ "apss", 631, QCOM_SMEM_HOST_ANY },
};

struct stats_config {
	size_t stats_offset;
	size_t ddr_stats_offset;
	size_t num_records;
	bool appended_stats_avail;
	bool dynamic_offset;
	bool subsystem_stats_in_smem;
};

struct ddr_stats_entry {
	u32 name;
	u32 count;
	u64 duration;
};

struct stats_data {
	bool appended_stats_avail;
	void __iomem *base;
};

struct sleep_stats {
	u32 stat_type;
	u32 count;
	u64 last_entered_at;
	u64 last_exited_at;
	u64 accumulated;
};

struct appended_stats {
	u32 client_votes;
	u32 reserved[3];
};

static void qcom_print_stats(struct seq_file *s, const struct sleep_stats *stat)
{
	u64 accumulated = stat->accumulated;
	/*
	 * If a subsystem is in sleep when reading the sleep stats adjust
	 * the accumulated sleep duration to show actual sleep time.
	 */
	if (stat->last_entered_at > stat->last_exited_at)
		accumulated += arch_timer_read_counter() - stat->last_entered_at;

	seq_printf(s, "Count: %u\n", stat->count);
	seq_printf(s, "Last Entered At: %llu\n", stat->last_entered_at);
	seq_printf(s, "Last Exited At: %llu\n", stat->last_exited_at);
	seq_printf(s, "Accumulated Duration: %llu\n", accumulated);
}

static int qcom_subsystem_sleep_stats_show(struct seq_file *s, void *unused)
{
	struct subsystem_data *subsystem = s->private;
	struct sleep_stats *stat;

	/* Items are allocated lazily, so lookup pointer each time */
	stat = qcom_smem_get(subsystem->pid, subsystem->smem_item, NULL);
	if (IS_ERR(stat))
		return 0;

	qcom_print_stats(s, stat);

	return 0;
}

static int qcom_soc_sleep_stats_show(struct seq_file *s, void *unused)
{
	struct stats_data *d = s->private;
	void __iomem *reg = d->base;

Annotation

Implementation Notes